ScrumbleShip is the most accurate space combat simulation devised to date. Gather resources, construct a capital ship out of individual blocks, then pilot it with AI or human help against other players.
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I signed into the server this morning to find myself in the center of this!
At a guess, I think it's a ring space station meant to rotate to provide artificial gravity. The interior of the doughnut bit is hollow. Eventually I want to provide subtly rounded voxels to make designing things like these easier, but for now this setup is quite neat!
Cheers,
-Dirk
Wow, very cool!